In hydroponic culture, what is the purpose of bubbling air into the solute?
A) to keep dissolved nutrients evenly distributed
B) to provide oxygen to the root cells
C) to inhibit the growth of aerobic algae
D) to inhibit the growth of anaerobic bacteria
E) to provide carbon dioxide for photosynthesis
Answer: B
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What is the process in which impulses jump from node to node?
A. facilitated transmission B. refractory action C. incomplete transfer D. repolarization E. saltatory conduction
What is the function of a fish's operculum?
A. To protects the gills B. To detects biofields in the immediate vicinity C. To detects movements in the surrounding water D. To provides buoyancy
The figure illustrates
a. repression of the lactose operon. b. promotion of the lactose operon. c. formation of a repressor molecule. d. attachment of lactose to DNA. e. all of these.
The cells involved in innate immunity, whose absence increases the chances of developing malignant tumors, are _____
A) cytotoxic T cells B) natural killer cells C) macrophages D) B cells